The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2022
Filed:
Jul. 11, 2018
Basf SE, Ludwigshafen am Rhein, DE;
Christian Bittner, Ludwigshafen am Rhein, DE;
Guenter Oetter, Ludwigshafen am Rhein, DE;
Jack F. Tinsley, Houston, TX (US);
Hans-Christian Raths, Düsseldorf-Holthausen, DE;
Marcel Patrik Kienle, Limburgerhof, DE;
Sebastian Alexander Weisse, Ludwigshafen am Rhein, DE;
BASF SE, Ludwigshafen am Rhein, DE;
Abstract
The present invention relates to a method for the production of crude oil from subterranean, oil-bearing formations comprising at least the following steps of providing an aqueous surfactant composition comprising water and a surfactant mixture, injecting said surfactant composition into the subterranean, oil-bearing formation through at least one injection well, thereby reducing the crude oil-water interfacial tension to less than 0.1 mN/m, and withdrawing crude oil from the formation through at least one production well, wherein the surfactant mixture comprises at least a surfactant (A) having the general formula R—O—(CHCH(R)O)—(CHCH(CH)O)—(CHCHO)—R—YM(I) and a solubility enhancer (B) having the general formula R—O—(CHCH(CH)O)—(CHCHO)—R—YM(II), wherein Rto R, a, b, c, x, y, Y and M have the meaning as defined the the description and claims. The invention further relates to said aqueous surfactant composition and methods for preparing the same as well as the use of solubility enhancer (B) for enhancing the solubility of anionic surfactant (A).